If TC bores were deformed by them installing sites I think we would have heard of it by now. If in fact you think your bore is tight in spots because of them installing sites mail it back.
TC bores are known to be tight and JB takes care of the issue. Many shooters can confirm this.
Have a good day
Still waiting a response from Mike on the issue. If anyone has heard of it or had issues with it, Mike will be the guy. I've shot T/C since the Encore first came out and haven't had a single barrel problem or, one that wouldn't shoot extremely accurate. I'm NOT saying barrels can't be deformed but, if it were the case, every muzzleloader would have the identical problem.
TC, as an organization no longer exists. The custom shop was closed. The Icon was discontinued. Not just discontinued, but the factory refuses to work on your Icon if it is out of warranty or supply parts. My Icon barrel came from the factory full of chatter marks. I bought it used from a dealer in NY, sight unseen, so my own fault. I tried to arrange to send it to the factory to have the barrel and stock replaced at my cost and the service people refused. I have a transcript of the "chat" posted here on this forum. I was shocked to say the least. I am now on my own to reverse engineer and sort out my paperweight. Of course none of the barrel makers has a breech configuration for the Icon.
So sorry, but try to get any service out of TC today ? I think you will be surprised.
Brought the issue of "deforming" a barrel when drilling for sights and/or scope mounts to a number of "smiths".
The response from some very seasoned smiths ALL indicate that, ..."ONLY if its drilled to deep, making the wall to thin or drilled completely through." Those are the only circumstances that any had ever run into this issue. If its not drilled to the point of drilling through or, drilled through, not a single smith has identified an issue.
They're total JUNK. If I were given one, I'd get rid of it and not even shoot it. I had my first chance to examine two (2) different rifles today. Its no wonder you don't see any great target pictures from them. That hinge with both barrels open, moved at least 1/4" at the end of the barrels. At least 3/16" movement with the barrels closed. Sorry but I wouldn't even consider one......